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#432396 - 05/31/19 09:55 PM ADA-1500: A BEAST of an amp!
Mojo Offline
axiomite

Registered: 01/21/07
Posts: 5930
I reported a while back I flipped a couple of M5s on top of each other and connected them in parallel. In my room, this sounded very good - better than the M100v4. I found the images created on some songs unnaturally large though so I experimented a little by moving them further apart and adding spacers (port plugs) between the cabinets. What do you know? They sound great! See link.

https://drive.google.com/open?id=1-HTUof-ixrhav2AVhY0gi980WgAU2ZkR

I'm feeding them from an ADA-1500 and sitting 13 feet away. I can push them to 1350 peak Watts each...maybe more because I'm not sure I'm really capturing the peaks. This is at around +3 on my Onk. Even though the M5s are crossed at 80Hz to my 800v4, on bass-heavy songs the 1500/M5 combo gives in before my ears do on some well-recorded tunes. The songs that are shutting them down have some nice peaks in between some "quiescent" periods. These songs are "Drums of Thunderdome" by Estrella Boyer, the vintage version of St. Louis Blues by Wycliffe Gordon and a few others that are of similar acoustic signature. On Wycliffe Gordon, I can push each M5 to 1500W peak...LOL!

I'm surprised by how much power is really needed to get a visceral sense of well-recorded music. On these tunes, I could have used more power - a lot more. As I've said before, movies are a completely different story. I don't need an ADA and the Onk is just fine on BluRays at around -15.

Still, the ADA-1500 is a BEAST! Those M5s in parallel represent a load of around 3 Ohms which is a full Ohm below the rated load impedance of the 1500. That's 1300W to 1500W peak into 3 Ohms. That's 21 Amps of peak current into each pair of M5s!

If I replace the M5s with M100s, the ADA-1500 sources 2800W peak and the SPL is so high, I just can't take it even at 13 feet away.

I'm really looking forward to checking out the active M5s.
_________________________
M100,VP160,QS10HPx2,EP800,M5HP,M3,M50 v4
M80,VP150,QS8x4,EP600 v2
ADA-1000-2,3,1500-3
Air N2

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#432398 - 05/31/19 11:10 PM Re: ADA-1500: A BEAST of an amp! [Re: Mojo]
Mojo Offline
axiomite

Registered: 01/21/07
Posts: 5930
I should also mention those M5s swallowed that power like a champ. They sounded totally composed.
_________________________
M100,VP160,QS10HPx2,EP800,M5HP,M3,M50 v4
M80,VP150,QS8x4,EP600 v2
ADA-1000-2,3,1500-3
Air N2

Top
#432399 - 06/01/19 09:07 AM Re: ADA-1500: A BEAST of an amp! [Re: Mojo]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 6208
Loc: Bowmanville, Ontario, Canada
Nice. Now all you need is a pair of M5's as a center channel laugh
_________________________
M60ti, VP180, QS8, M2ti
M5HP, M40
LFR1100, soon to be active
EP500, PC+ 20-39

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#432400 - 06/01/19 12:24 PM Re: ADA-1500: A BEAST of an amp! [Re: Mojo]
Mojo Offline
axiomite

Registered: 01/21/07
Posts: 5930
Aye. A single M5 as a centre does sound puny.
_________________________
M100,VP160,QS10HPx2,EP800,M5HP,M3,M50 v4
M80,VP150,QS8x4,EP600 v2
ADA-1000-2,3,1500-3
Air N2

Top
#432402 - 06/01/19 02:15 PM Re: ADA-1500: A BEAST of an amp! [Re: Mojo]
brendo Offline
devotee

Registered: 10/14/14
Posts: 479
Loc: West coast Canada
Wow nice set up.

It's totally surprising how fast power demands actually go up. For minimal increases in volumes. We're told by so many oh 50 to a 100 Watts is ample. Heck even a tube is enough for some. Then we get in to party mode and realize that was only enough for background listening.

Looks like a fun weekend stacking and experimenting

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#432404 - 06/01/19 02:45 PM Re: ADA-1500: A BEAST of an amp! [Re: Mojo]
Mojo Offline
axiomite

Registered: 01/21/07
Posts: 5930
Yeah...when it comes to music, 50W or 100W is not good enough for speakers of typical sensitivity. It might be good enough for something like La Scalas but they have other problems.
_________________________
M100,VP160,QS10HPx2,EP800,M5HP,M3,M50 v4
M80,VP150,QS8x4,EP600 v2
ADA-1000-2,3,1500-3
Air N2

Top
#432408 - 06/01/19 11:43 PM Re: ADA-1500: A BEAST of an amp! [Re: Mojo]
2x6spds Offline
connoisseur

Registered: 03/16/02
Posts: 3186
Loc: CA, USA
Hi Mojo

Did you get a reading on an SPL meter while blowing mega watts through your M5s?
_________________________
Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.

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#432409 - 06/02/19 12:37 AM Re: ADA-1500: A BEAST of an amp! [Re: Mojo]
Mojo Offline
axiomite

Registered: 01/21/07
Posts: 5930
Phil, my reference song for gauging peaks cleanly is Renee Olstead's Hit the Road Jack.

With that tune, four M5s in twin-parallel configuration as described above, crossed at 80Hz to my 800v4, I measure 111.5 dBC peaks at 13 feet away in my 4,200 cu. ft. room before the ADA-1500 throws in the towel.

In 5.1 PLII music, with the 160v4 powered by the third channel of the ADA-1500 and 2xQS10 powered by the Onk, I measure 112 clean dB.

This may sound like it's loud, and it is, but it's not ridiculous due to the nature of the song. I'd love to hear those peaks at 120dB. smile

Anyone reading this, I highlight the following: 111.5 clean dBC at 13 feet away, with amazing fidelity and holographic soundstage, for under $US7K! If I was the competition, I'd be quaking in my boots.



_________________________
M100,VP160,QS10HPx2,EP800,M5HP,M3,M50 v4
M80,VP150,QS8x4,EP600 v2
ADA-1000-2,3,1500-3
Air N2

Top
#432410 - 06/02/19 12:52 AM Re: ADA-1500: A BEAST of an amp! [Re: Mojo]
Mojo Offline
axiomite

Registered: 01/21/07
Posts: 5930
If you read some of my other posts, you come to the realization that twin M5s per channel with an ADA-1500 have 11.5 dBC more output than single M5s per channel with an ADA-1000. 3dB of this 11.5dB comes from stacking the M5s. The remaining 8.5dB comes from replacing the 1000 with a 1500.
_________________________
M100,VP160,QS10HPx2,EP800,M5HP,M3,M50 v4
M80,VP150,QS8x4,EP600 v2
ADA-1000-2,3,1500-3
Air N2

Top
#432411 - 06/02/19 01:01 AM Re: ADA-1500: A BEAST of an amp! [Re: Mojo]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 6208
Loc: Bowmanville, Ontario, Canada
A bit of that might come from wiring the M5's in parallel and so presenting a lower impedence to the amp... but I don't remember offhand what a single M5 is rated at impedence-wise.
_________________________
M60ti, VP180, QS8, M2ti
M5HP, M40
LFR1100, soon to be active
EP500, PC+ 20-39

Top
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